[Smart Home] 6-way WiFi controller with metering

Special reminder: This project involves 220V strong electricity. Although the neutral line is used as the reference ground, you will not die if you touch the low-voltage part. But after all, there is no isolation, and it is still quite dangerous if the zero fire is accidentally connected. If you need to reproduce, please be extra careful.
The reason for making this thing is that the bathroom heater in the main bathroom and the light switch in the dining room are in the same place. The bathroom heater has two levels of air heating, one for blowing, one for ventilation, and 5-way lighting control. In addition to the dining room lights, I need to connect to the homeassistant at the same time. So this project came into being. Since I am not a professional player, if I have any questions about the PCB layout, please advise.
Welded finished product:
 
Installation environment:
Installed behind these four 86 switches. Although my house is decorated with wooden boards on the wall, there is a certain gap between the wall and the wooden boards, but the volume of the boards still needs to be controlled. The current size of the board is the smallest size I can personally achieve. . .
 
Firmware: Because it is to directly connect to homeassistnat, esphome is used.